Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating activities:
Consolidated net income	$ 6,139	$ 53,600	$ 25,426
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Depreciation and amortization	18,626	17,240	13,776
Stock-based compensation expense	15,302	12,869	10,264
Provision for doubtful accounts	0	43	5
Deferred income taxes	6	(34)	(72)
Litigation-contingency expense	19,500	0	6,500
Amortization of bond premium	0	0	1,056
Credit gain on available-for-sale securities	0	0	(3)
(Decrease) increase in long-term deferred revenue	(1,020)	875	(268)
Decrease (increase) in other assets	1,109	(192)	(692)
Increase in long-term income taxes payable	1,159	1,366	293
Change in current assets and liabilities, net	(9,979)	(11,239)	(33,346)
Net cash provided by operating activities	50,842	74,528	22,939
Investing activities:
Additions to property, plant and equipment and internal-use software	(23,602)	(33,452)	(63,966)
Sales and maturities of short-term investments	0	0	45,000
Net cash used for investing activities	(23,602)	(33,452)	(18,966)
Financing activities:
Proceeds from employee stock plans	8,490	10,602	4,439
Repurchases of Common Stock	(497)	0	0
Net cash provided by financing activities	7,993	10,602	4,439
Effect of foreign exchange rates on cash	(179)	(70)	(219)
Net increase in cash and cash equivalents	35,054	51,608	8,193
Cash and cash equivalents at beginning of year	242,219	190,611	182,418
Cash and cash equivalents at end of year	277,273	242,219	190,611
Change in current assets and liabilities:
Accounts receivable	(483)	12,640	(10,586)
Inventories	457	(5,236)	(34,204)
Other current assets	(7,886)	(539)	1,547
Accounts payable and accrued liabilities	(1,845)	(11,151)	4,399
Accrued severance and other charges	(9)	9	(93)
Short-term lease liabilities	131	583	103
Income taxes payable	(684)	674	6
Deferred revenue and customer prepayments	340	(8,219)	5,482
Change in current assets and liabilities, net	(9,979)	(11,239)	(33,346)
Supplemental disclosures:
Cash paid during the year for income taxes, net of refunds	4,302	4,151	1,263
Purchases of property, plant and equipment and internal-use software incurred but not yet paid	$ 1,946	$ 2,168	$ 4,194